WHERE WAS THE VELVET ROPE?

A teenager was arrested Wednesday night for allegedly breaking into pop diva Janet Jackson's dressing room during a concert at New York's Nassau Coliseum. Mario Backman, 19, allegedly stole stuffed animals, an FDNY cap and some letters. He was charged with third-degree burglary and released without bail. Speaking of unruly fans, Steven Spielberg has been granted a restraining order against a man who allegedly broke into the &uuml;berproducer's DreamWorks office on Jan. 11.